Find familiar
From Ardrana
The find familiar spell enables the caster to attempt to summon a familiar to act as his aide and companion. Familiars are typically small animals, such as cats, frogs, ferrets, crows, hawks, snakes, owls, ravens, toads, weasels, or even mice, but particularly adept spellcasters might summon a more powerful creature such as a pseudodragon or even a being from another plane such as an imp or quasit. A creature acting as a familiar can benefit a wizard, conveying its sensory powers to its master, conversing with him, and serving as a guard/scout/spy as well. A wizard can have only one familiar at a time, however, and he has no control over what sort of creature answers the summoning, if any at all come.
Note: This version of find familiar originally appeared in the 2nd Edition Player's Handbook for Advanced Dungeons & Dragons from TSR. Its use here is for the purposes of providing context for the campaign only.